When you're sitting in a class (usually in a packed lecture hall)and you are distracted by what a person in front of you is doing on their computer.
Could be due to any laptop but it is usually Mac Books; because of their slick configuration, popularity and flawless distractability for anyone in a 15 foot radius.
I couldn't concentrate at all today in my RN103 Lecture because this guy in front of me was simultaneously taking notes, chatting on Facebook, watching 30 Rock on Hulu and playing Tetris. The whole time I suffered from second-hand mac distract.
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